Seborrheic Keratosis: A Rare Clinical Appearance

A variety of clinical appearance of Seborrheic Keratosis have been already reported. We report the case of a 16-year-old woman who presented with itchy brownish papules on the right side of her chest with dermatomal distribution for 2 years. Diagnosis of the dermatosis was histologically evident. It seems that linear and dermatomal Seborrheic Keratosis is a new clinical variant. CASE REPORT A 16-year-old woman presented with a 2 -year history of itchy brownish papules localized on the right side of chest. (Fig. 1, 2) It began whit dark brownish macules and patches on the right side of lower chest near to midline and gradually change to brownish papules and spread to the outer side of chest. The lesions became itchy. There was no underline disease. Figure 1 Figures 1, 2: Papules on the right side of the chest Figure 2 The initial diagnosis was epidermal nevus , wart , localized Darier,s Disease. A biopsy was performed and the histology showed hyperkeratosis and achantosis with basaloid appearance and true and pseudo horn cysts in the epidermis and chronic inflammatory reaction in dermis (Fig. 3,4). Seborrheic Keratosis: A Rare Clinical Appearance 2 of 4 Figure 3 Figure 3: Hyperkeratosis , achantosis, horn cysts Figure 4 Figure 4: True and psudo cysts